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Core Configuration
Table 4-2. Status Register Bit Definitions (Continued)
Bit Number
13
Bit Name
SC
Reset Value
0
Description
Sixteen-Bit Compatibility Mode
Affects addressing functionality, enabling full compatibility with object code
written for the DSP56000 family. When SC is set, MOVE operations to/from
any of the following PCU registers clear the eight MSBs of the destination:
LA, LC, SP, SSL, SSH, EP, SZ, VBA and SC. If the source is either the SR
or OMR, then the eight MSBs of the destination are also cleared. If the
destination is either the SR or OMR, then the eight MSBs of the destination
are left unchanged. To change the value of one of the eight MSBs of the SR
or OMR, clear SC.
SC also affects the contents of the Loop Counter Register. If SC is cleared
(normal operation), then a loop count value of zero causes the loop body to
be skipped, and a loop count value of $FFFFFF causes the loop to execute
the maximum number of 2 24 – 1 times. If the SC bit is set, a loop count
value of zero causes the loop to execute 2 16 times, and a loop count value
of $FFFFFF causes the loop to execute 2 16 – 1 times.
Note:
Due to pipelining, a change in the SC bit takes effect only after
three instruction cycles. Insert three NOP instructions after the
instruction that changes the value of this bit to ensure proper
operation.
12
0
Reserved. Write to 0 for future compatibility.
11–10
S[1–0]
0
Scaling Mode
Specify the scaling to be performed in the Data ALU shifter/limiter and the
rounding position in the Data ALU MAC unit. The Shifter/limiter Scaling
mode affects data read from the A or B accumulator registers out to the
X-data bus (XDB) and Y-data bus (YDB). Different scaling modes can be
used with the same program code to allow dynamic scaling. One
application of dynamic scaling is to facilitate block floating-point arithmetic.
The scaling mode also affects the MAC rounding position to maintain
proper rounding when different portions of the accumulator registers are
read out to the XDB and YDB. Scaling mode bits are cleared at the start of
a long Interrupt Service Routine and during a hardware reset.
S1
0
S0
0
Scaling
Mode
No scaling
Rounding Bit
23
SEquation
S = (A46 XOR A45)
OR (B46 XOR B45)
OR S (previous)
0
1
Scale down
24
S = (A47 XOR A46)
OR (B47 XOR B46)
OR S (previous)
1
0
Scale up
22
S = (A45 XOR A44)
OR (B45 XOR B44)
OR S (previous)
1
1
Reserved
—
S undefined
DSP56311 User’s Manual, Rev. 2
4-8
Freescale Semiconductor
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